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Prometheus and Grafana

Prometheus is an open-source monitoring system with efficient time series database and a modern alerting approach. Together with Grafana it's the recommended way to make sure that your node and validator(s) are performing correctly.

Prometheus​

To start, download Prometheus from https://prometheus.io/download/. Unzip the downloaded .zip file and run Prometheus from its installed location with the lodestar prometheus.yml passed in as the configuration file

./prometheus --config.file=$dataDir/prometheus.yml
info

8008 is also the default port specified in the prometheus.yml in the lodestar repository

Then run the Lodestar beacon node with

lodestar --metrics=true --metrics.port=8008

Navigate to http://localhost:9090/ in your browser to verify that Prometheus is monitoring Lodestar

Grafana​

Download and install Grafana from its official repository https://grafana.com/docs/grafana/latest/installation/debian/

Add Prometheus as a data source to Grafana https://prometheus.io/docs/visualization/grafana/#installing

An example of relevant metrics of interest to monitor are:

  • nodejs_heap_space_size_used_bytes
  • nodejs_eventloop_lag_seconds
  • beaconchain_peers
  • beaconchain_current_slot
  • beaconchain_current_finalized_epoch